First up, though, is Android 4.3 (Jelly Bean). Sony still needs to upgrade a number of devices to the previous version of Google’s mobile OS, and that will start next month. Devices getting the update include the Xperia Z, Xperia ZL, Xperia ZR, Xperia Tablet Z, Xperia SP, Xperia Z Ultra, and Xperia Z1. On top of that, the Xperia T, Xperia TX and Xperia V will skip updates to Android 4.2 and go straight to Android 4.3.

Now for KitKat. Sony didn’t reveal the timing, but devices in the “first raft” of KitKat updates will include the Xperia Z, Xperia ZL, Xperia Tablet Z, Xperia Z Ultra and Xperia Z1.

Since those phones are all expecting an update to Android 4.3 first, I wouldn’t expect to see KitKat arrive any time soon. And even after Sony has readied the updates, there’s still the matter of carriers approving them and pushing them out. That’s not an ideal situation, but it’s less of an issue with Sony and more of an issue with Android fragmentation in general. Google made KitKat able to run on lower-specced devices in an effort to combat fragmentation, but manufacturers and carriers need to make the software available in order for this to work — something even Google itself is struggling with.

Ultimately, though, this is good news for many Xperia device owners, who know their devices will be updated — someday.